And proportional representation is found in the House of Representatives. We have a bicameral legislature.
An extensive study [0], showed "Basically, average citizens only get what they want if economic elites or interest groups also want it"
They studied actual attitudes about issues, moneyed attitudes, and tracked what got implemented as laws. NONE of the 'thinking, protesting, commenting, of demanding' was effective. MONEY was.
[0] https://www.vox.com/2014/4/18/5624310/martin-gilens-testing-...